High efficiency photovoltaic roof tile with static concentrator

The use of a static concentrator as an integral component within a photovoltaic roof tile has the potential to significantly lower costs by replacing expensive solar cells with relatively inexpensive acrylic lenses. A light trapping scheme based on a 3-dimensional rear surface structure for the roof tile enables reflected light from the rear to be skewed around so as to be totally internally reflected at the top surface interface with the air. This is achieved while retaining overall dimensions that fit within the constraints imposed by conventional roof tiles. This paper describes the construction of a prototype roof tile module and initial results of outdoor testing. Also given is a selection of bifacial solar cells that are useful for incorporation in the module.<<ETX>>

[1]  Martin A. Green,et al.  A new method for accurate measurements of the lumped series resistance of solar cells , 1993, Conference Record of the Twenty Third IEEE Photovoltaic Specialists Conference - 1993 (Cat. No.93CH3283-9).

[2]  Allen M. Barnett,et al.  Polycrystalline silicon‐film™ solar cells: Present and future , 1994 .

[3]  Martin A. Green,et al.  685 mV open-circuit voltage laser grooved silicon solar cell , 1994 .

[4]  J. Miñano,et al.  Limit of concentration under extended nonhomogeneous light sources. , 1983, Applied optics.

[5]  M. Green,et al.  Advancements in silicon buried contact solar cells , 1990, IEEE Conference on Photovoltaic Specialists.

[6]  Martin A. Green,et al.  Present status of buried contact solar cells , 1991, The Conference Record of the Twenty-Second IEEE Photovoltaic Specialists Conference - 1991.

[7]  Richard M. Swanson,et al.  Point and planar-junction p-i-n silicon solar cells for concentration applications. Fabrication, performance and stability , 1990, IEEE Conference on Photovoltaic Specialists.

[8]  J. C. Miñano,et al.  Construction and Measurement of a Prototype of P.V. Module with Static Concentration , 1991 .

[9]  Martin A. Green,et al.  Improved optical design for photovoltaic cells and modules , 1991, The Conference Record of the Twenty-Second IEEE Photovoltaic Specialists Conference - 1991.

[10]  M. Green,et al.  Innovative structures for thin film crystalline silicon solar cells to give high efficiencies from low quality silicon , 1994, Proceedings of 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC and PSEC).